Influence of preconditioning and curing methods on the durability performance of alkali-activated binder composites

2021 ◽  
Vol 311 ◽  
pp. 125346
Author(s):  
V. Jittin ◽  
P. Madhuri ◽  
Manu Santhanam ◽  
A. Bahurudeen
Keyword(s):  
Curing Methods ◽  
Durability Performance ◽  
Alkali Activated

Using of recycled clay brick/fine soil to produce sodium hydroxide alkali activated mortars

2021 ◽  
pp. 136943322110157
Author(s):  
Radhwan Alzeebaree ◽  
Arass Omer Mawlod ◽  
Alaa Mohammedameen ◽  
Anıl Niş
Keyword(s):  
Compressive Strength ◽  
Water Absorption ◽  
Sodium Hydroxide ◽  
Clay Brick ◽  
Fine Soil ◽  
Brick Powder ◽  
Naoh Solution ◽  
Water Sorptivity ◽  
Durability Performance ◽  
Alkali Activated

In the study, the recycled clay brick powder/fine soil powder-based sodium hydroxide alkali-activated mortar (AAM) specimens were prepared by mixing different percentages (100/0, 80/20, 60/40, 40/60, 20/80, and 100/0, respectively) to investigate the mechanical and durability performance of sustainable AAM specimens for the possible utilization instead of OPC. The constant ratio of glass powder was used in the production of AAM to increase the alkalinity and improve the mechanical properties of alkali-activated mortar. Also, the influences of sodium hydroxide molarity concentrations (8, 10, 12, 14, and 16 M) on the performance of AAM specimens were studied. The compressive strength, water absorption, and water sorptivity tests were conducted on the AAM specimens and the relationships between the investigated parameters were analyzed. The obtained results revealed that the fine soil powder replacement with clay brick powder improved the compressive strength, and reduced water absorption and water sorptivity up to 80% replacement ratios, and the superior mechanical and durability performance was obtained in the 80% fine soil powder-based AAM specimens. For the higher fine soil powder replacement ratio (100%), the performances of the AAM specimens were found to be adversely affected. Besides, the concentration of NaOH solution significantly influenced the material performances of the fine soil powder-based AAMs and 12 M NaOH concentration performed superior mechanical and durability performance. The strength enhancement of the AAMs was found to be significant after 90 days of ambient curing period.

scholarly journals Drying Shrinkage, Sulphuric Acid and Sulphate Resistance of High-Volume Palm Oil Fuel Ash-Included Alkali-Activated Mortars

2022 ◽  
Vol 14 (1) ◽  
pp. 498
Author(s):  
Ghasan Fahim Huseien ◽  
Mohammad Ali Asaad ◽  
Aref A. Abadel ◽  
Sib Krishna Ghoshal ◽  
Hussein K. Hamzah ◽  
...  
Keyword(s):  
Sulphuric Acid ◽  
Palm Oil ◽  
Control Sample ◽  
Drying Shrinkage ◽  
High Volume ◽  
Palm Oil Fuel Ash ◽  
Fuel Ash ◽  
Oil Fuel ◽  
Durability Performance ◽  
Alkali Activated

Nowadays, an alkali-activated binder has become an emergent sustainable construction material as an alternative to traditional cement and geopolymer binders. However, high drying shrinkage and low durability performance in aggressive environments such as sulphuric acid and sulphate are the main problems of alkali-activated paste, mortar and concrete. Based on these factors, alkali-activated mortar (AAM) binders incorporating high-volume palm oil fuel ash (POFA), ground blast furnace slag (GBFS) and fly ash (FA) were designed to enhance their durability performance against aggressive environments. The compressive strength, drying shrinkage, loss in strength and weight, as well as the microstructures of these AAMs were evaluated after exposure to acid and sulphate solutions. Mortars made with a high volume of POFA showed an improved durability performance with reduced drying shrinkage compared to the control sample. Regarding the resistance against aggressive environments, AAMs with POFA content increasing from 0 to 70% showed a reduced loss in strength from 35 to 9% when subjected to an acid attack, respectively. Additionally, the results indicated that high-volume POFA binders with an increasing FA content as a GBFS replacement could improve the performance of the proposed mortars in terms of durability. It is asserted that POFA can significantly contribute to the cement-free industry, thus mitigating environmental problems such as carbon dioxide emission and landfill risks. Furthermore, the use of POFA can increase the lifespan of construction materials through a reduction in the deterioration resulting from shrinkage problems and aggressive environment attacks.

A review on the durability performance of alkali-activated binders subjected to chloride-bearing environment

2022 ◽  
Vol 317 ◽  
pp. 125947
Author(s):  
Babatunde Abiodun Salami ◽  
Mohammed Ibrahim ◽  
Hassan Amer Algaifi ◽  
Wasiu Alimi ◽  
Adeoluwa Oladapo Ewebajo
Keyword(s):  
Alkali Activated Binders ◽  
Durability Performance ◽  
Alkali Activated

Effects of source materials, fineness and curing methods on the strength development of alkali-activated binder

2020 ◽  
Vol 29 ◽  
pp. 101147 ◽  
Author(s):  
Md Rezaul Karim ◽  
Md Maruf Hossain ◽  
Md Manjur A Elahi ◽  
Muhammad Fauzi Mohd Zain
Keyword(s):  
Strength Development ◽  
Curing Methods ◽  
Source Materials ◽  
Alkali Activated

scholarly journals Durability Performance On Alkali Activated Metakaolin And Bottom Ash Based Geopolymer Concrete

2021 ◽  
Author(s):  
Logesh Kumar M ◽  
Revathi V
Keyword(s):  
Sodium Hydroxide ◽  
Bottom Ash ◽  
Acid Resistance ◽  
Curing Temperature ◽  
Geopolymer Concrete ◽  
Test Results ◽  
Conventional Concrete ◽  
Durability Performance ◽  
Alkali Activated ◽  
Ambient Curing

Abstract This paper presents an experimental investigation on the durability properties of metakaolin (MK) and bottom ash (BA) blended geopolymer under different environmental exposure. The blended geopolymer concrete (GPC) was prepared with sodium based alkaline activators under ambient curing temperature. The concentration of sodium hydroxide used was 8M. The ratio of sodium silicate to sodium hydroxide was kept as 2.0. The performance of blended geopolymer concrete was compared with conventional concrete (CC). The test results reveal that blended geopolymer concrete develops a better performance against sulphate and acid resistance. Also, MK- BA GPC shows enhanced performance over the conventional concrete in terms of sorptivity, rapid chloride and water absorption.

Sign in / Sign up

Export Citation Format

Share Document